Genghis Khan was the founder of the Mongol empire, which historians say was the largest contiguous empire in history

The rise of Genghis Khan and the huge Mongol Empire in the early 13th Century may have been helped by good weather, scientists suggest.

American researchers studying the rings of ancient trees in central Mongolia have discovered that his rise coincided with the mildest, wettest weather in more than 1,000 years.

Grass grew at a rapid rate, providing fodder for his war horses.

Genghis Khan united the Mongol tribes to invade and rule a vast area.

It covered modern-day Korea, China, Russia, eastern Europe, India and south-east Asia.

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